package ai.kastrax.mcp.transport.sse

import io.github.oshai.kotlinlogging.KotlinLogging
import io.ktor.client.HttpClient
import io.ktor.client.request.*
import io.ktor.client.statement.*
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow

private val logger = KotlinLogging.logger {}

/**
 * SSE 会话接口
 */
interface SSESession {
    /**
     * 接收 SSE 事件
     */
    suspend fun receive(): String?
    
    /**
     * 关闭会话
     */
    suspend fun close()
    
    /**
     * 发送 SSE 事件
     */
    suspend fun send(event: String, data: String)
}

/**
 * SSE 客户端
 */
object SSE {
    /**
     * 创建 SSE 客户端
     */
    fun client(url: String, headers: Map<String, String> = emptyMap()): SSESession {
        logger.debug { "Creating SSE client for $url" }
        return object : SSESession {
            private var isClosed = false
            
            override suspend fun receive(): String? {
                if (isClosed) {
                    return null
                }
                
                // 简单的模拟实现
                return null
            }
            
            override suspend fun close() {
                isClosed = true
                logger.debug { "SSE session closed" }
            }
            
            override suspend fun send(event: String, data: String) {
                if (isClosed) {
                    logger.warn { "Attempting to send to closed SSE session" }
                    return
                }
                
                logger.debug { "Sending SSE event: $event, data: $data" }
            }
        }
    }
}

/**
 * 扩展函数，用于从 HttpResponse 创建 SSE 会话
 */
fun HttpResponse.respondSSE(): SSESession {
    logger.debug { "Creating SSE session from HttpResponse" }
    return object : SSESession {
        private var isClosed = false
        
        override suspend fun receive(): String? {
            if (isClosed) {
                return null
            }
            
            // 简单的模拟实现
            return null
        }
        
        override suspend fun close() {
            isClosed = true
            logger.debug { "SSE response session closed" }
        }
        
        override suspend fun send(event: String, data: String) {
            if (isClosed) {
                logger.warn { "Attempting to send to closed SSE session" }
                return
            }
            
            logger.debug { "Sending SSE event: $event, data: $data" }
        }
    }
}
